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JP2008167384

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DESCRIPTION JP2008167384
PROBLEM TO BE SOLVED: In a room where a sound field has been corrected, if the environment
in the room changes while listening to music, the sound field is not corrected as it is. SOLUTION:
A model transfer function (3) is obtained from an intermediate signal (1) and an output signal (2),
and the model transfer function (3) is used to correct a sound field. [Selected figure] Figure 1
Sound field correction system
[0001]
The present invention relates to a system for correcting a sound field.
[0002]
In the past, a test tone or the like was sounded in order from each speaker and measured by
picking up with a microphone to obtain a transfer function, and the transfer function was used to
correct the sound field.
ヤマハ“YPAO”など。 Yamaha DSP AV amplifier "DSP-Z9" reference URL http: // www.
yamaha. co. jp / product / av / prd / dspav / dsp-z9 / index. html
[0003]
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1
This has the following drawbacks. When the transfer function changes due to a change in
speaker layout, a change in room layout, a change in listening position, etc., measurement is
carried out by picking up the test tone again from each speaker and picking up with a
microphone to correct the sound field. I needed to find the function again. In addition, it was
necessary to interrupt the music etc. which had been heard for this correction. The present
invention was made to eliminate the above-mentioned drawbacks.
[0004]
The intermediate signal (1) and the output signal (2) are obtained by observation. A model
transfer function (3) is obtained from the intermediate signal (1) and the output signal (2). Using
the model transfer function (3), construct a system to correct the sound field.
[0005]
Since the intermediate signal (1) and the output signal (2) can always be observed, even when the
transfer function changes, measurement is performed by picking up the test tone again from
each speaker and picking it up with a microphone to correct the sound field. This saves time and
effort in finding the transfer function. In addition, it is not necessary to interrupt the music or the
like that has been heard in order to correct the change of the transfer function.
[0006]
The sound field correction filter is disposed in front of the speaker, and the microphone is
disposed at the listening position. If it is necessary to update the sound field correction filter due
to environmental changes, obtain the intermediate signal (1) and the output signal (2) by
observation, determine the model transfer function (3), and use that model transfer function (3)
Update the sound field correction filter.
[0007]
Next, an example of constructing a system for correcting a sound field with two speakers and two
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2
microphones will be shown. FIG. 2 is a block diagram showing the configuration in the case of
two speakers and two microphones. ここでは、 1. The signal observed by the microphone
through the actual transfer path G is compared with the signal output through the model transfer
function M so that the square of the error is minimized by the LMS algorithm. 2. The signal
observed by the microphone and the desired signal at the microphone position are compared,
and the LMS algorithm is used to minimize the square of the error. In some cases, the sound field
is corrected. By doing this, the desired acoustic signal can be heard at the microphone position
without being adversely affected by the transfer function inherent to the sound field. Also, the
same system can be constructed even when the number of speakers and the number of
microphones are different.
[0008]
It is explanatory drawing of this invention. It is a block diagram showing composition of an
example of the present invention.
Explanation of sign
[0009]
1 intermediate signal 2 output signal 3 model transfer function 4 sound field correction filter
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